Study of reducing electromagnetic vibration by claw-pole brazing for automobile claw-pole alternators

Automobile claw-pole alternators have been the subject of much active research with its increasing development. As for reducing electromagnetic vibration and noise of claw-pole alternators, a method of magnet pole brazing based on mechanical vibration theory is proposed to reduce the amplitude of electromagnetic radial vibration and torque ripple. Magnetic pull on rotor surface can be calculated by using Maxwell Tensor, and a mass-spring-damping resonant system is built to analyze the instantaneous forces and radial vibration on the individual poles of the alternator with magnet pole brazing. The method is validated with Finite Element Analysis (FEA) and simulation results show the analysis of air gap flux density and torque ripple with different axial brazing length.